使用声明的encoding = utf-8 - Java从xml中删除非UTF-8字符 [英] remove non-UTF-8 characters from xml with declared encoding=utf-8 - Java
问题描述
我从一个声明为encoding = utf-8的客户端以XML形式获得请求。不幸的是,它可能不包含utf-8个字符,并且需要从我身边的xml中删除这些字符(旧版)。
让我们考虑一个例子,这个无效XML包含£(磅)。
1)我得到xml作为java字符串与£在其中(我现在没有访问接口,但我可能得到xml作为java字符串)。我可以用replaceAll(£,)去掉这个字符吗?任何潜在的问题?
2)我将xml作为字节数组 - 在这种情况下如何安全地处理这个操作?
1)我得到xml作为java字符串与其中(我现在没有访问接口,但我可能得到xml作为一个java串)。我可以用replaceAll(£,)去掉这个字符吗?
我假设你的意思是想要摆脱非 ASCII 字符,因为你在谈论一个遗产方面。您可以使用以下正则表达式来摆脱可打印ASCII范围之外的任何内容:
string = string.replaceAll([^ \\\x20-\\\x7e],);
2)我将xml作为字节数组 - 如何处理在这种情况下,这个操作是安全的吗?
你需要包装 byte []
在 ByteArrayInputStream
,以便您可以使用 InputStreamReader
,其中您指定编码,然后使用 BufferedReader
逐行阅读。
例如
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(bytes),UTF-8));
for(String line;(line = reader.readLine())!= null;){
line = line.replaceAll([^ \\\x20-\\x7e] ,);
// ...
}
// ...
I have to handle this scenario in Java:
I'm getting a request in XML form from a client with declared encoding=utf-8. Unfortunately it may contain not utf-8 characters and there is a requirement to remove these characters from the xml on my side (legacy).
Let's consider an example where this invalid XML contains £ (pound).
1) I get xml as java String with £ in it (I don't have access to interface right now, but I probably get xml as a java String). Can I use replaceAll(£, "") to get rid of this character? Any potential issues?
2) I get xml as an array of bytes - how to handle this operation safely in that case?
1) I get xml as java String with £ in it (I don't have access to interface right now, but I probably get xml as a java String). Can I use replaceAll(£, "") to get rid of this character?
I am assuming that you rather mean that you want to get rid of non-ASCII characters, because you're talking about a "legacy" side. You can get rid of anything outside the printable ASCII range using the following regex:
string = string.replaceAll("[^\\x20-\\x7e]", "");
2) I get xml as an array of bytes - how to handle this operation safely in that case?
You need to wrap the byte[]
in an ByteArrayInputStream
, so that you can read them in an UTF-8 encoded character stream using InputStreamReader
wherein you specify the encoding and then use a BufferedReader
to read it line by line.
E.g.
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(bytes), "UTF-8"));
for (String line; (line = reader.readLine()) != null;) {
line = line.replaceAll("[^\\x20-\\x7e]", "");
// ...
}
// ...
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